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MMPDS-01<br />

31 January 2003<br />

Figure 2.3.1.2.8(b). Best-fit S/N curves for notched, K t = 1.5, 4130 alloy <strong>steel</strong> sheet,<br />

normalized, longitudinal direction.<br />

Correlative Information for Figure 2.3.1.2.8(b)<br />

Product Form:<br />

Sheet, 0.075 inch thick<br />

Properties: TUS, ksi TYS, ksi Temp., EF<br />

117 99 RT<br />

(unnotched)<br />

123 -- RT<br />

(notched)<br />

K t 1.5<br />

Specimen Details: Edge Notched, K t = 1.5<br />

3.00 inches gross width<br />

1.50 inches net width<br />

0.76 inch notch radius<br />

Surface Condition:<br />

Reference:<br />

Electropolished<br />

3.2.3.1.8(d)<br />

Test Parameters:<br />

Loading - Axial<br />

Frequency - 1100-1500 cpm<br />

Temperature - RT<br />

Environment - Air<br />

No. of Heats/Lots: Not specified<br />

Equivalent Stress Equations:<br />

Log N f = 7.94-2.01 log (S eq - 61.3)<br />

S eq = S max (1-R) 0.88<br />

Std. Error of Estimate, Log (Life) = 0.27<br />

Standard Deviation, Log (Life) = 0.67<br />

R 2 = 84%<br />

Sample Size = 21<br />

[Caution: The equivalent stress model may<br />

provide unrealistic life predictions for stress<br />

ratios beyond those represented above.]<br />

2-32

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